Palestine was a British

Great Britain

Great Britain or Britain is an island situated to the northwest of Continental Europe. It is the ninth largest island in the world, and the largest European island, as well as the largest of the British Isles...

 Thoroughbred

Thoroughbred

The Thoroughbred is a horse breed best known for its use in horse racing. Although the word thoroughbred is sometimes used to refer to any breed of purebred horse, it technically refers only to the Thoroughbred breed...

 racehorse

Horse racing

Horse racing is an equestrian sport that has a long history. Archaeological records indicate that horse racing occurred in ancient Babylon, Syria, and Egypt. Both chariot and mounted horse racing were events in the ancient Greek Olympics by 648 BC...

. Owned and bred by HH Aga Khan III

Aga Khan III

Sir Sultan Muhammed Shah, Aga Khan III, GCSI, GCMG, GCIE, GCVO, PC was the 48th Imam of the Shia Ismaili Muslims. He was one of the founders and the first president of the All-India Muslim League, and served as President of the League of Nations from 1937-38. He was nominated to represent India to...

 he was out of the mare Una and sired by Fair Trial

Fair Trial

Fair Trial was a British Thoroughbred racehorse and Champion sire. He was bred and raced by John Arthur Dewar who also bred and raced Tudor Minstrel....

.

Trained by Marcus Marsh

Marcus Marsh

Marcus Maskell Marsh was an English racehorse trainer whose British Classic wins included the Epsom Derby and St. Leger with Tulyar and Windsor Lad as well as the 2,000 Guineas with Palestine...

 and ridden by Charlie Smirke, Palestine was the winner of the 2,000 Guineas in 1950. In all he won eleven of his thirteen outings.

Palestine retired to stud in 1951 and in 1964 was the leading Irish

Ireland

Ireland is an island to the northwest of continental Europe. It is the third-largest island in Europe and the twentieth-largest island on Earth...

sire of two year olds.